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254 lines
6.9 KiB
Groff
254 lines
6.9 KiB
Groff
.\" mkinitrd.5 Robby Workman <rworkman@slackware.com>
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.\" 28 August 2010 "
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.TH MKINITRD.CONF 5 "27 March 2010" "Slackware 13.1"
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.SH NAME
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.B mkinitrd.conf(5)
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.SH SYNOPSIS
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.B mkinitrd.conf - optional configuration file for
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.I mkinitrd(8)
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.SH DESCRIPTION
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The
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.I mkinitrd.conf
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file contains options to be passed to
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.I mkinitrd(8)
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on every run if mkinitrd is executed with the -F flag.
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.br
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It is intended as a fast and easy way for the system administrator to
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pass options to mkinitrd without having to type them on each execution.
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Options passed to
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.I mkinitrd(8)
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on the command line will override any
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values set in the config file.
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.SH OPTIONS AND SYNTAX
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All options are in the format of OPTION="value"
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.br
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Unset variables have no effect.
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.TP 5
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.I SOURCE_TREE
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This is the location for the initrd's source tree.
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.br
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Defaults to "/boot/initrd-tree"
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.TP 5
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.I CLEAR_TREE
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This option specifies whether to clear the initrd source tree prior to
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creating the initrd.
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.br
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This requires a value of either "0" or "1" where 0=no and 1=yes
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.br
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Examples:
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.br
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CLEAR_TREE="0" # Do not clear initrd tree first
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.br
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CLEAR_TREE="1" # Clear initrd tree first
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It is recommended to leave this unset and pass "-c" on the command line
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when clearing the tree is desired. Clearing the tree is not desirable
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if you wish to build support for more than one kernel into the initrd
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image.
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.TP 5
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.I OUTPUT_IMAGE
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This is the location for the initrd image that is created.
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.br
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Defaults to "/boot/initrd.gz"
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.br
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If %KVER% and/or %SLACKVER% are present in the string, they will be replaced
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with $KERNEL_VERSION (e.g. "4.4.75-smp") and Slackware Version (e.g. "14.2")
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respectively in the name of the generated file.
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.TP 5
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.I KERNEL_VERSION
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This is the kernel version for which the initrd should be created.
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.br
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Defaults to "$(uname -r)"
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.TP 5
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.I KEYMAP
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This is the custom keyboard map that should be loaded instead of the
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default 'us' keymap.
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.br
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The file /usr/share/mkinitrd/keymaps.tar.gz contains all possible keymaps
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to choose from (omit the '.bmap' extension in the mkinitrd command)
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.br
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Example: KEYMAP="nl"
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.TP 5
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.I MODULE_LIST
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This should be a colon-separated list of modules you wish to be included
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in the initrd image.
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.br
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Example: MODULE_LIST="ext3:mbcache:jbd"
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If you have loadtime options that you need to specify when loading kernel
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modules, those can be added here as well.
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.br
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Example: MODULE_LIST="module1:module2 option=1:module3"
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.TP 5
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.I LUKSDEV
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Contains a colon (:) delimited list of luks encrypted block devices to be
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unlocked by the initrd using cryptsetup. The list may include any of: device
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node path, UUID, or LABEL. All devices that must be unlocked in order to
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access the root filesystem must be specified.
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.sp
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Example: LUKSDEV="/dev/sda2:/dev/sda3"
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.br
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Example: LUKSDEV="UUID=ec6dea40-c8d8-4590-850a-a757be60e45a"
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.br
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Example: LUKSDEV="LABEL=darkstar"
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Each unlocked device will be assigned an automatically generated luks device
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name of the form luks<device> where '<device>' will be the basename of the
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encrypted device. e.g.
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/dev/mapper/lukssda2
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As a convenience to users, if
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.I ROOTDEV
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(see below) specifies one of the device names listed in the
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.I LUKSDEV
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option, then it will be automatically adjusted to use the correct luks
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device name. i.e. when specifying
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.I "LUKSDEV=/dev/sda2"
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then
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.I "ROOTDEV=/dev/sda2"
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and
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.I "ROOTDEV=/dev/mapper/lukssda2"
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are equivalent.
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.TP 5
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.I LUKSKEY
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When using cryptsetup to encrypt your partition, you can use a keyfile instead
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of a passphrase to unlock the LUKS volume. The LUKSKEY variable holds the
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filename of a keyfile, as well as the label (or uuid) of the partition this
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file is on. This way, you can unlock your computer automatically if you have a
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USB stick with your LUKS key inserted at boot. A passphrase will still be asked
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if the LUKS key can not be found.
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.br
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For example, if your USB thumb drive has a FAT partition with label
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"TRAVELSTICK" and the actual keyfile is called "/keys/alien.luks", then
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you need to set:
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.br
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LUKSKEY="LABEL=TRAVELSTICK:/keys/alien.luks"
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.TP 5
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.I LUKSTRIM
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Contains a colon (:) delimited list of luks encrypted block devices to be
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passed the "--allow-discards" option when unlocked by the initrd using
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cryptsetup. This has the effect of allowing TRIM on SSD drives. Be sure
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your SSD supports this feature (correctly) before enabling it.
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.br
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See fstrim(8) for more information.
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.br
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Example: LUKSTRIM="/dev/sda2:/dev/sda4"
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.TP 5
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.I ROOTDEV
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The device on which your root filesystem is located.
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May be a device node path, UUID, or LABEL. See LUKSDEV examples.
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.br
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Example: ROOTDEV="/dev/sda2"
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If you are using cryptsetup and an encrypted root filesystem, be sure to
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read the option above for LUKSDEV or Bad Things will happen.
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.TP 5
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.I ROOTFS
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The filesystem type of your root filesystem
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.br
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Example: ROOTFS="ext3"
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.TP 5
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.I RAID
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This option adds the mdadm binary to the initrd to support RAID.
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Additional modules may be required, depending on your kernel
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configuration. If you wish to add LVM support to the initrd, then
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set this to 1; otherwise, leave it unset or set it to 0.
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.br
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Examples:
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.br
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RAID="0" # Do not add RAID support to initrd
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.br
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RAID="1" # Add RAID support to initrd
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.TP 5
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.I LVM
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This option adds support for LVM partitions into the initrd.
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If you wish to add LVM support to the initrd, then set this to 1;
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otherwise, leave it unset or set it to 0.
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.br
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Examples:
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.br
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LVM="0" # Do not add LVM support to initrd
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.br
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LVM="1" # Add LVM support to initrd
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.TP 5
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.I UDEV
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Use UDEV in the initrd.
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.br
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Examples:
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.br
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UDEV="0" # Do not use udev in the initrd
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.br
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UDEV="1" # Use udev in the initrd (this is the default)
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.TP 5
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.I WAIT
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This defines the time to wait, in seconds, until all disks are detected.
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.br
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This is useful for allowing extra time that might be needed for slow usb disks or systems with large amounts of storage to become ready.
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.br
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If not defined, the default is 1 second.
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.TP 5
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.I RESUMEDEV
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The swap partition holding your hibernation image.
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.br
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Example: RESUMEDEV="/dev/sda2"
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.TP 5
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.I MODCONF
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This option defines whether to copy the module-init-tools config files
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from /etc/modprobe.d/ into the initrd. This will not usually be necessary,
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but if you need certain modules to be loaded with special options, and you
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have this configured in a file in /etc/modprobe.d/, this is one way to
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accomplish the desired goal.
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.br
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Examples:
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.br
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MODCONF="0" # Do not add /etc/modprobe.d/* to the initrd
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.br
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MODCONF="1" # Add /etc/modprobe.d/* to the initrd
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.TP 5
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.I MICROCODE_ARCH
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This option specifies a cpio archive containing updated microcode for your CPU.
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CPU manufacturers occasionally release such updates to fix bugs in the microcode
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currently embedded in the CPU. The microcode archive will be prepended to the
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output initrd, where the kernel will find it for early patching.
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.br
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Examples:
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.br
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MICROCODE_ARCH="/boot/intel-ucode.cpio"
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.SH FILES
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.I /etc/mkinitrd.conf
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.br
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See /etc/mkinitrd.conf.sample
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.SH "SEE ALSO"
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.BR mkinitrd "(8)"
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.SH BUGS
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None known :-)
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.SH MISCELLANEOUS
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Support for mkinitrd.conf was added in mkinitrd-1.3.0
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